Can I use the special seatbelts on adapted busses to hold my baby’s pram?

What document regulates the service and also specifies the rights and duties of customers?

“El Reglamento de Prestación y Uso del Transporte Urbano en autobuses para la Ciudad de Valencia”(Regulations for offering and use of Urban Transport for the City of Valencia), approved by the City Council and that is being applied since September 2005.